Dial for radio apparatus



July 26, 1927.

F. W. RENWICK DIAL FOR RADIO APPARATUS Original Filed Feb. 1925 2 Sheets-Sheet 1 FIG.2.

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July 26, 1927. 37,051

F. W. RENWICK DIAL FOR RADIO APPARATUS Original Filed Feb. 16, 1925 2 Sheets-Sheet 2 FIG. 6 m Fla. 7'.

Jn mule! Patented July 26, 192 7.

PATENT OFFICE.

FREDERICK W. RENWICK, F CAMDEN, NEW JERSEY.

DIAL FOR RADIO APPARATUS.

Application filed February 16, 1925, Serial No. 9,606. Renewed February 12, 1927.

This invention relates to improvements in dialsfor radio apparatus.

The primary object of this invention is providing a dial, having a weighted portion, adapted for use in connection with radio apparatus having an unbalanced rotatable element, whereby the weighted portion of the dial will counterbalance the said unbalanced element to prevent unintentional shifting of the said element due to gravitational forces.

A further object of the invention is to provide a dial of the above mentioned type wherein the weighted portion is wholly confined within the margins of the dial.

A still further object of the invention is to provide a dial, as set forth above, having the outward appearance, when in use, of an ordinary dial.

Other objects and advantages of the invention will be apparent during the course of the following description.

In the accompanying drawings forming a part of this specification and in which like numerals are employed todesignate like parts throughout the same,

Figure 1 is a fragmentary front elevational view of one form of dialembodying this invention,

Figure 2 is a transverse sectional view taken upon line II II of Fig. 1,

Figure 3 is a rear elevational view, partly broken away, of a modified form of dial embodying this invention, t

Figure at is a transverse sectional view taken upon line IV-IV of Fig. 3, 1

Figure 5 is a detail perspective view of the adjustable weight carried by the dial shown in Figs. .1 and2,

Figure 6 is a rear elevational view of a further modified form of dial embodying this invention,

Figure 7 is a: transverse sectional view taken upon line VIIVII of Fig. 6,

Figure 8 is a rear elevational view of a further modified form of a dial embodying this invention,

Figure 9 is a transverse sectional view taken upon lines" IX-IX of Fig. 8, and

Figure 10 is adetail perspective view of the type of counterbalancing weight carried by the dial shown in Figs. 8 and 9.

Referring to the accompanying drawings and particularly to Figs. 6 and 7, the numeral 5 designates the body portion of a dial having the hub portion 6 which pro-.

jects axially through the hollowed-out part 7 ofthe said body portion 5, the remaining part of said body portion being solid, as at 8, to provide an eccentrica'lly weighted or overbalanced dial. It is to be understood that this dial may be formed by any suitable operation, such as by molding from bakelite, rubberoid, etc., and'the solid or weighted portion 8 is to be formed of the same material from which. the body portion 5 is formed.

Referring particularly to Figs. 3 and 4, it will be seen thatthe body portion 9 of the dial is solid and is provided with a bush ing 10. This solid body portion is molded from any suitable material and, during the molding. of the same, is provided with a weight or metallic body 11,,made of lead or the like,- which is entirely embedded within the margins of the dial and is provided with any desired number of apertures 12 through which the material of the body portion 9 may flow for anchoring the weight 11, as shown. It will be understood that this weight 11 produces an overbalanced .or eceentrically weighted dial.

By' referring particularly to Figs. 1, 2 and 5, it will be seen that a dial is provided with a shell-like or hollow body portion 13 having the integral hub 14 extending axially therethrough which is provided with the bushing 15. Adjustably mounted upon the projecting portion of this bushing 15, the said bushing being formed of. greater axiah length than the hub 14, is a sector-shaped plate-like weight 16. This weight is mounted upon the projecting portion of the bushing 15 by meansof the arms 16 -having the a-pertured ears 16 through the apertures of which the screw 16 extends. It will be noted that this weight 16 produces an overbalanced. or eccentrically weighted dial and-that the weight may be adjusted in respect to the said dial.

In Figs. 8, 9, and 10, a dial is illustrated as having a shell-like or hollow body portion 17 formed with a hub 18 and a projecting bushing 19. A pair of sector-shaped, platelike weights 20 are provided and have the apertured ears 20 adapted for receiving the projecting portion of the bushing 19. For the purpose. of retaining these welghts 20 in any desired adjusted position, such as illustrated in Fig. 8, a ring 21 is positioned upon. the end of the bushing 19 and is held in place by the'set screw 22. This ring 21 may be forced against the apertured ear portions of the plate-like weights 20 for the purpose of binding the same against each other and the end of the hub 18 which prevents unintentional relative movement of the same. It will be seen that this form of dial is vided with adjustable, eccentric weights, for producing an, overbalanced dial structure;

It is well known, to those familiar with radio apparatus, that quite a number of different types of instrulnentalities'," such as plate condensers, are provided withrotatable elements or portionswhich are unbalanced. During the operation of these instrumentalities the rotatable elements are frequently adjusted tova ssume positions where they are overbalanced with the result that gravitational forces will cause an unintentional shifting of the adjustable or rotatable elements whereby the proper tuning of the instrumentalities is destroyed. The various forms of dials embodying this invention are each provided with an eccentric weighted portion which, when properly arranged in respect to an unbalanced element of a radio apparatus, will act as a counterbalance for the same and will prevent unintentional shifting of the said rotatable element. It is believed that the abovetde'scription of the various forms of dials embodying this invention will enable those skilled in the art to completely understand and appreciate the same, and that no further explanation is deemed necessary.

It is'to be understood that the forms of this invention herewith shown and described are to be taken as preferred examples of the same, and that various changes in the shape, size, and arrangement of parts may be resorted to without departing from the spirit of the invention or the scope of the subjoined claims.

Having thus described the invention, I claim v 1. As a new article of manufacture, a radio apparatus dial having a projecting bushing portion, and a weighted body promounted on the projecting port-ion of the bushing.

2. As a new article of manufacture, a radio apparatus dial having a hub portion of less axial length than the axial length of the dial body, a bushing within the bore of the hub portion of greater axial length thanthe hub portion, and a body eccentrically carried by the projecting portion of the bushing.

3. As a new article of manufacture, a radio apparatus dial having a hub portion of less axial length than the axial length of the dial b0dy,'a bushing within the bore oi the hub portion of greater axial length than the hub portion, and a body eccentrically 'adjustably carried by the projecting portion of the bushing.

4. As a new article of manufacture, a radio apparatus dial having a hub portion of less axial lengththan the axial length of the dial body, a bushing within the bore of the hub portion of greater axial length than the hub portion, and a pair of weights carried 'by and adjustable eccentrically in respect to the said bushing.

As a new article of manufacture, a radio apparatus dial, and a pair of sectorshaped plates carried by the dial and adjustable inrespect to' each other and the dial body.

6. As a new article of manufacture, a

radio apparatus dial, and a pair of eccentric.

weights carried by and adjustable independcarried by the same within its margins.

In testimony whereof I ailix my signature.

FREDERICK W. RENWICK. 

